A current of 0.5 A flows through a 100 Ω resistor. Voltage across it is MCQ with Answer and Explanation

Explanation:
Speed of sound: solids > liquids > gases. In steel ~5000 m/s, water ~1500 m/s, air ~340 m/s. Vacuum no propagation. Speed depends on density and elasticity.

Explanation:
In uniform circular motion, the magnitude of velocity (speed) remains constant. However, the direction of motion is continuously changing tangentially at every point on the circular path. Since velocity is a vector quantity (requiring both magnitude and direction), a change in direction means the velocity is changing continuously, resulting in an accelerated motion.

Explanation:
Convection: bulk fluid motion carries heat (natural: density-driven; forced: pump/fan). Conduction: molecular collisions; radiation: EM waves. Memory aid: 'Convection = fluid flow + heat; e.g., boiling, weather'. Heat transfer mode frequently tested in competitive exams.